tests/topotests/bgp_conditional_advertisement_track_peer/test_bgp_conditional_advertisement_track_peer.py

   1 #!/usr/bin/env python
   2 # SPDX-License-Identifier: ISC
   3
   4 #
   5 # Copyright (c) 2022 by
   6 # Donatas Abraitis <donatas@opensourcerouting.org>
   7 #
   8
   9 """
  10 Conditionally advertise 172.16.255.2/32 to r1, only if 172.16.255.3/32
  11 is received from r3.
  12
  13 Also, withdraw if 172.16.255.3/32 disappears.
  14 """
  15
  16 import os
  17 import sys
  18 import json
  19 import pytest
  20 import functools
  21
  22 CWD = os.path.dirname(os.path.realpath(__file__))
  23 sys.path.append(os.path.join(CWD, "../"))
  24
  25 # pylint: disable=C0413
  26 from lib import topotest
  27 from lib.topogen import Topogen, TopoRouter, get_topogen
  28 from lib.common_config import (
  29     step,
  30 )
  31
  32 pytestmark = [pytest.mark.bgpd]
  33
  34
  35 def build_topo(tgen):
  36     for routern in range(1, 5):
  37         tgen.add_router("r{}".format(routern))
  38
  39     switch = tgen.add_switch("s1")
  40     switch.add_link(tgen.gears["r1"])
  41     switch.add_link(tgen.gears["r2"])
  42
  43     switch = tgen.add_switch("s2")
  44     switch.add_link(tgen.gears["r2"])
  45     switch.add_link(tgen.gears["r3"])
  46
  47
  48 def setup_module(mod):
  49     tgen = Topogen(build_topo, mod.__name__)
  50     tgen.start_topology()
  51
  52     router_list = tgen.routers()
  53
  54     for i, (rname, router) in enumerate(router_list.items(), 1):
  55         router.load_config(
  56             TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
  57         )
  58         router.load_config(
  59             TopoRouter.RD_STATIC, os.path.join(CWD, "{}/staticd.conf".format(rname))
  60         )
  61         router.load_config(
  62             TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
  63         )
  64
  65     tgen.start_router()
  66
  67
  68 def teardown_module(mod):
  69     tgen = get_topogen()
  70     tgen.stop_topology()
  71
  72
  73 def test_bgp_conditional_advertisement_track_peer():
  74     tgen = get_topogen()
  75
  76     r1 = tgen.gears["r1"]
  77     r2 = tgen.gears["r2"]
  78     r3 = tgen.gears["r3"]
  79
  80     if tgen.routers_have_failure():
  81         pytest.skip(tgen.errors)
  82
  83     def _bgp_converge():
  84         output = json.loads(
  85             r2.vtysh_cmd(
  86                 "show bgp ipv4 unicast neighbors 192.168.1.1 advertised-routes json"
  87             )
  88         )
  89         expected = {
  90             "advertisedRoutes": {"172.16.255.2/32": None},
  91             "totalPrefixCounter": 0,
  92             "filteredPrefixCounter": 0,
  93         }
  94         return topotest.json_cmp(output, expected)
  95
  96     # Verify if R2 does not send any routes to R1
  97     test_func = functools.partial(_bgp_converge)
  98     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
  99     assert result is None, "R2 SHOULD not send any routes to R1"
 100
 101     step("Enable session between R2 and R3")
 102     r3.vtysh_cmd(
 103         """
 104     configure terminal
 105         router bgp
 106             no neighbor 192.168.2.2 shutdown
 107     """
 108     )
 109
 110     def _bgp_check_conditional_static_routes_from_r2():
 111         output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast json"))
 112         expected = {
 113             "routes": {
 114                 "172.16.255.2/32": [{"valid": True, "nexthops": [{"hostname": "r2"}]}]
 115             }
 116         }
 117         return topotest.json_cmp(output, expected)
 118
 119     # Verify if R1 received 172.16.255.2/32 from R2
 120     test_func = functools.partial(_bgp_check_conditional_static_routes_from_r2)
 121     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 122     assert result is None, "R1 SHOULD receive 172.16.255.2/32 from R2"
 123
 124     step("Disable session between R2 and R3 again")
 125     r3.vtysh_cmd(
 126         """
 127     configure terminal
 128         router bgp
 129             neighbor 192.168.2.2 shutdown
 130     """
 131     )
 132
 133     # Verify if R2 is not sending any routes to R1 again
 134     test_func = functools.partial(_bgp_converge)
 135     _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
 136     assert result is None, "R2 SHOULD not send any routes to R1"
 137
 138
 139 if __name__ == "__main__":
 140     args = ["-s"] + sys.argv[1:]
 141     sys.exit(pytest.main(args))